Resto haste

If your group is running you as backup get some IP traits, haste and vers, and let them know you will be dpsing outside of the dmg spikes. BoD has pretty low healing requirements outside of burst phases, so you can probably afford to have 1 or 2 of your healers doing dps for a good amount of the fight. Then when there is alot to heal drop cds, and use high power spells like chain and rain.